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Note 9 - Net (Loss) Income Per Common Share (Tables)
 12 Months Ended
Aug. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerator:   August 31, 2020   August 31, 2019
Net (loss) income attributable to NTIC   $
(1,337,709
 )   $
5,209,622
  
                 
Denominator:                
Basic-weighted shares outstanding    
9,096,981
      
9,085,584
  
Weighted shares assumed upon exercise of stock options    
-
      
330,390
  
Diluted – weighted shares outstanding    
9,096,981
      
9,415,974
  
                 
Basic net (loss) income per share:   $
(0.15
 )   $
0.57
  
Diluted net (loss) income per share:   $
(0.15
 )   $
0.55